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The surface tension of ethanol is less than half that of water. If you could find a relatively stable, nontoxic, substance with a low surface tension that wouldn't react with the wax to compramize the usability of your pearls, you could try that.

Otherwise, the way they make lead shot for shotguns is to drip the molten lead through a screen. It then falls straight down a cooling chute until it hits the bottom cool and hard. The only problem I see with this is that hardened wax is a lot softer. When it hits the bottom it could still deform. Maybe a gradually sloping chute would be better. (Think of a straight down chute, sloping into something that looks like a playground slide.)